Netflix Issue?

When I am watching netflix and hover my cursor over another tab, I see a preview of that site well that preview makes neteflix player straight black nothing I can do but refresh Netflix over 5 times? Also the plugins in Opera stop working.

Well it happens to me a way to shut off tab preview would be nice.I also think having too much bloat will lag the browser and cause other issues. Either remove that or have an option to disable it would be nice.